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I FREDERICK A. KRUSEMARK, OF GHIGAGO,

Reissued Oct. 11, 1932 UNITED STATES PATENT OFFICE ILLINOIS, ASSIGNOR,BY MESNE ASSIGN- MENTS, TO THE LAMBERT TIRE AND RUBBER COMPANY, ACORPORATION 01 OHIO PNEUMATIG TIRE Original No. 1,594,102, dated July27, 1926, Serial No. 99,516, filed April 3, 1926. Application forreissue filed December 18, 1931.

My invention has for its object to provide certain new and usefulimprovements in puncture-resisting pneumatic tires of the kind whereinthe tread is of greater thickness than standard practice and is providedwith transverse openings (recesses, or holes extending partly orentirely through the tire from side to side), and it especially has forits object to provide such a tire with alternate notches or recesses andlugs at the sides of the tread, the recesses aligning with thetransverse openings and of a greater area than the diameter of theopenings, thereby leaving a series of lugs between adjacent openingswhose purpose is to guard the entrances to the openings and prevent orreduce cracking of the rubber at the entrances of the openings as wellas to serve as traction lugs when the tire is running over soft ground,such as sand or mud.

More subordinately the invention resides in those novel features ofconstruction, combination and arrangement of parts, all of which will befirst fully described, then be specifically pointed out in the appendedclaim, reference being had to the accompanying drawing, in which Fig. 1is a sectional perspective view of a portion of a tire showing oneembodiment of my invention (the openings in this embodiment passingthrough from side to side) Fig. 2 is a side elevation of the structureshown in Fig. 1;

Fig. 3 is a plan view of another embodiment of the invention (in thisembodiment the openings passing but partly through the tread and beingstaggered).

In the drawing in which like numerals of reference indicate like partsin all the figures, 1 represents the carcass of the tire which may bebuilt up in accordance with the usual practice, and 2 indicates thetread which in the present instance is built thicker than standardpractice and is provided with openings 3 (or 3 in Figure 3) which servenot only to increase the resiliency of the tread portion of the tire butprincipally to ventilate the tread rubber and prevent its overheatingwith consequent disintegration.

4 designates notches or recesses formed in Serial No. 581,982.

the tread portion of the tire in alignment with the various openings.These recesses or notches are of greater area in elevation than thediameter of the openings whereby lugs 5 are left between adjacentopenings, these lugs serving the two-fold purpose of protecting the tirecarcass at the mouth of the openings, and as traction lugs when the tireis rolling on a soft road bed as for instance in' sand or mud. I

It should, of course, be understood that the openings 3 may extendentirely through the tread from side to side (and this is a preferredembodiment) or they may be blind openings extending but partly into thetire the present invention being the provision of the notches orrecesses 4 and the intermediate lugs 5, the notches or recesses beingarran ed to align up with the openings, or in ot er words, the openingsbeginning at the inner side of the recesses or notches.

If desired the mouths of the openings may further be reinforced bycircular beads 6 formed on the inner vertical wall of the recesses ornotches.

From the foregoing description, taken in connection with theaccompanying drawing, it is thought the construction, operation andadvantages of my invention will be clear to those skilled in the art towhich it relates.

Having thus described my invention, what- I claim is:

A pneumatic tire having a thickened tread

